Welding-machine.



T. E. GRECELIUS.

WELDING 'MACHNIL APPLIOATION FILED APB. 24, 1912.

Patented Oct. 241, 1913.

4 SHEETS-SHEET 1.

T. E. CRBCELIUS. `WELDING MACHINE. APPLICATION FILED APB.24, 1912.

Patented Oct. 21, 1913.

4 SHEETS-SHEET 2.

T. E. GRECELIUS.

WELDING MACHINE. APPLICATION FILED APR.24, 1912A Patented 0013. 21, 1913.

4 SHEETS-SHEET a.

` w S51/... i 5% M Fi QM T. E. CRECELIUS.

WELDING MACHINE.

APPLIOATION FILED APR. 24, 1912.

4 SHEETS-SHEET 4.

l! V j I f. WIM ffm im Wim. WM... A z? 2,9 @06,6

fLIHALEfIHMQIB'E.Ef.(i1RJ:CELIUS,v OF ST. LOUIS, MISSOURI, ASSIGNOB TQ. MU'ILTIPLEX DISPLAY FIXTUQBEYCQMPANY, 0F ST. LQUIS, MISSOURI, A CORPORATION QE MISSOURI.

WELDING-MACHINE.

Specification afl Letters Patent.

Patented Oct. 21,1913..

Amlilctiml Ned April 24, 19512'. Serial. Ko. 0192,9472

To all 'whom z'ft may concern Be it known that I, THEoDoRr. E. Canoni LrUs, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented certain new and useful hm. proviemerts'iinWeldi eMachines, oct which the following. is a specification, reference being had to the` accompanying drawings, forming ka parthel'eof, 'in which- VFigure l' is al planzview of a welding-machine embodying my invention;-

2 is a sectional viewl taken appmximately on the line 2--2, Fig. l; Fig. 3 is an enlarged detail section taken approximately on the line 3.--3, Fig. l; Fig. 4 is a detail section taken on the line 414, Figi. 3, looking in the direction of the arrow', Fig. 5 is a detail section taken on' the lfine h-5, Fig. 3, looking in the direction oli the arrow; Fig. 6 is a detailsection taken approximately on the line Gef-6, Fig. 3, andV showingthe upper one 'of the pipe contactmembe'rs or jaws in elevated 4or open position; 7 is a detail section similar to Fig. 6, showing 4said uppei1| one of the pipe contactfmembcrs or jaws li-nlowered or closed position; and Fig. 8.is a detail sectiontaken approximate] on the line 8%8, Fig. 3.' j lThis inventionre ates generally to certain new andV useful improvements in electric welding-machines, and more particularly to a new and useful machine especially designed and adapted for rigidly and firmly unitinfr or securing together the adjacent ends o? sections of metallic pipes or tubing.

My new welding-machine is particularly designed and adapted, a'nd has heretofore been` used by me, for uniting or securing together sections of metallic pipes or't-ubing into the form of rectangular frames for wings or leaves for display-racks, such as shown and described in application of' Louis Feldmann, Jr., and myself' for Letters Patent for wings or leaves for display-racks, filed April 6, 1912, and serially numbered 689,027, and will be hel-ein described in that connection, but it will be understood that the same machine can be equallyrwell and advantageouslyv employed for weld-'ing joints between any cylindrical or tubular sections of metal or the like and uniting or securing the same together into other forms and rfor other purposesI or uses.

' In the formation or manufacture of rectangular frames composed of metallic tub- I ing', and particularly those framesy used in or as the swingable leaves or wings ordis-l play-racks, it has heretofore been, and is generally, the practice to employ or utilize metallic elbows or angle-pieces at the core ners, and for unitin or securing together the metallic tube sections, of theframe, the

legs of the' elbow or angle piece' being forced while cold into, and thusl seated'in,

the adjacent endsv of the tube sections. This practice, however, is troublesome, unsati-s-- I factory, and slow, and not only has'considerabl'e d lic'ulty been experienced in so. formingl strong, durable and. substantial' joints between the sections, butalso considerable loss to the manufacturer has been occasioned by the tubular: sections splitting or fracturing e'ndwise. Von thel forcing therein 'off the legs" of the elbows or angle-pieces and thus becoming or being rendered unfit for service or use.

It is the purpose and object of my invention to overcome or obviate the objectionable features just mentioned and to provide a machine or apparatus especially adapted to quickly and easily, rigidly, firmly, and substantially secure or unite together such el-` bows or joint-membersA and tube sections, any liability of', and consequent losses or increased expense due to, the Atube sections splitting or fracturing on being united with the joint-members being done away with.

According to my invention and practice, the tube section is first electrically heated at its end in order to soften and expand such end; the tube section is then moved to force the end so softened and expanded onto and around one of the legs of the joint-.member; and afterward the end of the tube sec-v tion is more or less rapidly cooled, when, as will be clear, it contracts and` shrinks around and thus becomes rigidly fixed upon the inclosed or encircled leg of the joint-member;- and with the foregoing object in View, my

invention resides particularly in the provision of an easily operated machine or apparatus of means adapted' to hold the jointmember or elbow and tube section. to be united in proper relation one tothe other; in the provision in such machine or apparatus of means whereby an electric current is caused to pass through and' heat, and thereby soften to the required degree 'andthus expand, the end of the tube section; in the provision in such machine or apparatus of means adapted to grip the tube section and shift the same relatively to the joint-member to force the end thereof so softened and expanded onto and around one of the legs of the joint-member; and in the novel construction of the several parts of my new machine or apparatus and in the novel arrangement and combination of the same, all as will hereinafter be described and afterward pointed out in the claims.

In the drawings, 1 designates a suitable table or supporting frame, and mounted on said table is a pair of plates 2, each of which is provided with a rearwardly projecting bracket 3. Plates 2 are normally spaced some distance horizontally apart, and fixedly arranged on said plates at their adjacent edges and insulated therefrom are preferably copper blocks 4 and 5.

Formed on block 4 is an integral portion or block 6, and projecting upwardly from the front portion of block 6 is a preferably integral jaw 7. Arranged to slide upon the rear portion of block 6 and opposing and adapted to coperate with Said jaw 7 is a block or jaw 8 likewise preferably of copper. Positioned between and preferably insulated from jaws 7 and 8, and adapted to be clamped in posit-ion thereby, is a block 9, in the top of which is a suitable recess 10 adapted to form a pocket or seat for an extension a of the metallic elbow or anglepiece or bar member A employed to provide the joint-member between the elongated hollow metallic members or tube sections B and C. Adjustably connected at one end to block or jaw 8, as shown particularly in Fig. 2, is a screw rod 11, theI opposite or other end thereof being connected by a pair of toggle links 12 to the forward end of a lever 13 fulcrumed on the corresponding one of the brackets 3. Pivotally mounted in the lower part of the frame or table 1 is a suitable foot-lever 14, and pivotally connected to the rear ends of levers 13 and 14 is a connecting-rod 15. Keepers in the form of plates 16 are mounted upon and fixed t0 jaws 7 and 8 and overlie the edges of said block 9 when said jaws 7 and 8 are in closed or clamping position; and clamped between said keepers and said jaws are the ends of elongated plates '17 that extend downwardly along the inner side of their respective jaws 7 and 8 and thence outwardlytherefrom, each of said plates being preferably bent or ianged upwardly at its outer end, as at 17, Pivotally connected to portion 17Aof the rear one of said plates 17 by means of a short arm 18 is a hollow block 19 that forms the lower one of the pipe contact-members of my machine. .Formed inthe top of this block is a notch or groove 20, and applied to and secured on the outer face of said block 19 and partially overlying said notch is a recessed contact plate 21.` A pair of short tubes 19a project from the bottom of hollow block 19, as shown particularly in Fig. 6, and connected thereto are the ends of flexible tubes 22 communicating with a source of cooling Huid supply, and thus means is provided for maintaining a circulation of cooling fluid through said hollow block 19 for well-understood purposes. Pivotally connected to the lower portion of the block 19 is the rear end of a curved lever 23 provided in its other or upper end with an open-ended eccentric groove 24, and projecting forwardly from this lever 23 is a suitable operating-handle 25.

Pivotally connected to portion 17 of the front one of said plates 17 is a pipe contactmember or hollow block 26 practically the counterpart of, and adapted to coperate with, said block 19,4 said block 26 being notched on its under side, as at 26, and carrying on its outer face a contact plate 27 that coincides with said contact plate 21 of block 19. Projecting from the top of block 26 is a similar pair of short tubes 26h, to which are connected flexible tubes 28 likewise communicating with a source of cooling fluid supply and thereby similarly providing means for maintaining a circulation of cooling fluid through said hollow block 26. Projecting from the outer face of-block 26 is a suitable pin carrying a roller 29 which is adapted to fit and engage in the groove 24 of lever 23 when block 26 is swung downwardly into closed or contacting position, as shown in Fig. 7,` and handle 25 is swung rearwardly.

Formed on the block-5 is an integral portion or block 30 and projecting upwardly from the forward end of this block is a jaw 31. Arranged to slide on the rear portion of this block 30 is a jaw 32 that opposes and coperates with aw 31, and connected to the rear portion of this sliding jaw 32 is one end of an adjustable screw-rod 33. The other or rear end of rod 33 is connected by toggle-links 34 to the forward end of a lever 35 fulcrumed on the corresponding one of said brackets 3. Pivotally connected to the rear end of lever 35 is the upper end of a rod 36, the lower end of which is pivotally connected to the rear end of a foot-lever 37 fulcrumed preferably adjacent foot-lever 14 on the lower portion of frame or table 1.

The means for supporting and` holding or gripping the section of tubing B and moving the said lengthwise to position its open end upon and around the portion of jointmember A comprises a block 38 arranged and mounted on the plate 2 which carries block 5, an elongated longitudinal slot 39 dividing said block 38 into upper and lower portions 38 and 38, respectively. Ar-` ranged for sliding movement on block 38, and in proper alinement and on substantially the same horizontal plane with block 9, is a preferably channel-shaped member or plate 40 having its flanges presented upwardly and in which is adapted to be seated and held the section of pipek or tubing B' and seated in thev underside o-f plate 40'-, an' projecting downwardly through a slot 41 in the upper portion 38a of block 38 is a pin 42 preferably centrally enlarged, as shown particularly in Fig. 3. Pivotally connected to the lower end of pin 42 is one end of a link 43 adapted to move and operate in said slot 39, the outer end of this link 43 being pivotally connected to one arm of' a suitable bell-crank lever 44 ful'crumed on a bracket 45 projecting upwardly' from table 1. Projecting outwardly from the other arm of bell-crank 44 is a suitable hand lever 46. Arranged preferably at the center' of plate 40 and operating through and slida-ble in suitable bearings 47 thereon, is a pair of oppo-sitely-disposed jaws 48, the ends of which are preferably concaved, as at 49, tov conform to theI shape of section of pipey or tub ing B. PivotallyA mounted on one of these jaws 4'8 is one end of a ha-nd lever' 50, and located onV the` opposite jaw is a roller 51 adapted to fit a-nd engage in an eccentric groove 52 formed inthe under side of an arcuate plate 53 integral with orl otherwise suitably connected to hand lever 50. These jaws 48, it might be here stated, are preferably reversible in their bearings 4'7 and at one end are cut awa-yl or co-ncaved to a greater degree than at the other, in order to accommodate and cla-mp therebetween in channel 40 sections of tubing B of different diameter.

Located at any suitable point, and preferably at a4 convenient point on the floor adjacent the forward ends of levers 14 and 37` is a suitable electric switch 54 normally held open by spring pressure as shown, and leading from one side of said switch to the block 6 is a suitable conductor Leading from theopposite side of said switch to a suitable generator 56 is a conductor 57, and leading` from the other side of the generator 56 to block 5 is a suitable conductor 58.

The operation of my machine is as follows: Block 9 being clamped in position between jaws 7 and 8, the extension a of an elbow or other metallic joint or bar member A is loosely seated in the recess or groove 10 thereof. The clamping of block 9 between its jaws 7 and 8 is accomplished, as will be clear, by depressing lever 14, which movement elevates rod 15 and swings lever 13 on its fulcrum, the rear ends of togglelinks 12 being thereby swung or pulled downwardly and rod 11 forced forwardly. And it might be here stated that normally lever 14 is maintained or held in such depressed or lowered position, the overlying oblique under faces of keepers 16 engaging with block 9 and assisting .to that end. Presuming jaws 48 to be in open position and upper pipe-contact member 26 to be in raised or o en position, as shown in Fig. 6, a section o pipe or tubing B is positioned in channel-plate 40 andl between jaws 31 and 32, the left hand end of tube B .resting upon and contacting with contact-plate or portion 21 of block 19 and being ,immediaftely adjacent and inY proper alinement with projecting leg b of joint-member A. The operator now depresses lever 37, whereby jaw 32, through its described connections therewith, will be moved toward jaw 31 and pipe Bv firmly clamped and held therebetween. Thehandle 50 is now 'drawn around toward the left, thereby engaging roller 51 in said groove 52, and owing to the shape of said groove, jaws 48 will be drawn toward each other, thereby firmly clamping the-body o'f the pipe or tube B to and within channel 40. Block or contact-member 26 is now swung rearwardly and downwardly into the position shown in Fig. 7, and with the parts thus arranged, the plates 21 and 27 contact withl the end of the pipe or tube B. The handle 25 is now pulled upwardly, thereby engaging the roller 29 in the groove 24, and owing to the eccentricity of said groove, said blocks or contact-members 19 and 26 will be dra-wn toward each other and plates 21 and 27. held in firm and positive contact with tube or pipe B'. As shown particularly in Fig. 1, it will be noted that small coiled springs 17b are suitably arranged and interposedA ont-he pivots of contact-membersv 19 and 26, soas to insure a good electrical contact between said members and their supporting plates 17. The operator now closes the electric circuit by depressing or operating switch 54, when current from the generator passes through conduetor 58 into the copper block 30 and jaw 31, thence through the end of pipe or tube B, through contact plates 21 and 27 and their supportinganembers 19 and 26, then through plates 17 to copper block 6 and its jaw 7, and from thence through conductor 55, switch 54, and conductor 57, back to the generator 56. It might be here stat/ed that block 9 for holding the joint or bar member A in this operation is preferably separate and insulated from block 6 so as to prevent the joint or bar member A receiving or being in any way affected by the electric current flowing through jaw 7 and block 6. The electric current passing through the end of pipe or tubing B quickly heats and softens the same to the required degree, and as soon as this is accomplished, the switch 54 is permitted to open andl the foot-pressure llU . forcing tube C upon the other leg ward block upon lever 37 is removed to permit jaw 32 to draw away from and release the tube or pipe B. The handle 25 is now drawn downward to release roller 29 from groove 24 after which the upper contact-member 26 is raised or opened into the position thereof shown in Fig. 6. The handle 46 is now engaged and swung around toward the left hand, thereby actuating the bell-crank 44 and movin the link 43 toward the left in slot 39. (Ihannel 40, being connected to link 43 by means of said pin 42, is also moved toward the left upon the block 38, the enlarged portion of pin 42 operating or moving in said slot 41, and pipe B clamped between the jaws 48 mounted on channel 40 is likewise moved, and the left-hand end thereof, which has been so heated and softened, is forced onto and around the projecting leg b of elbow or joint-member A. Handle or lever 50 is now swung toward the right to disengage roller 51 from groove 52, thereby permitting jaws 48 to be moved apart, and pipe section B with' its jointmember A removed from the machine. As the heated end of pipe B now cools ofl', it shrinks and contracts upon the leg b of elbow or joint-member A and becomes firmly and rigidly fixed or united thereto.

The operations just described are repeated for each joint between the sections of tubing and the joint-pieces or elbows, and by such operations strong, rigid, and substantially unitary frames having solid and substantial joints are quickly and economically produced.

I might here add that in connection with my new welding machine I have heretofore used and employed an assembling table such as is shown and described in United States Letters Patent No. 1,060,430, issued to me April 29, 1913. Now, in Fig. 1, tube member C is shown united to the other leg or member of elbow A. In the operation of of elbow A, it might be here stated that block 9 is not generally employed. In such operation, the tube B with leg-b of elbow A united thereto as described is placed and suitably supported in the machine by means of said work-table in the position in which the tube C is shown in Fig. 1, with the opposite or fi'ee leg of the joint member presented to- 30 and jaws 31 and 32. f The tube C, being now clamped in member 40, is forced upon the projecting or free leg of elbow A in a manner similar to that in which tube B was forced upon leg b of elbow A as described. It will be noted that contact members 19 and 26 are sufficiently removed inwardly from jaws 7 and 8 by means ofthe bent plates 17 to accommodate tube B in this operation.

By utilizing a machine of my improved construction, the frames turned out or produced are uniform in size and appearance and the losses in the manufacture of such frames are reduced to a minimum, inasmuch as there is no danger of splitting or fracturing the ends of the tubes while the same are being forced onto the joint-pieces, the tubes being heated to such a degree as to be extremely ductile.

It will be readily understood that my new machine can be advantageously employed wherever it is desirable to form strong, rigid joints between the adjacent ends of tube sections and joint-members.

I am aware that minor changes in the size,

form, arrangement, construction, and combination of the several parts of my new machine may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a machine of the class described, the combination with a supporting frame, of insulated means on said frame for lengthwise holding a metallic bar-member in fixed position thereon, movable means shiftable on said frame adapted to support and hold an elongated hollow metallic member in longitudinal alinement with, and with one end thereof in operative position relatively to, said bar-member, means for heating only said end of said hollow member to soften the same, and means on said frame adapted to shift said movable means with its carried hollow member toward said bar-member to position the softened end of said hollow member upon and around said bar-member; substantially as described.

2. In a machine of the class described, the combination with a supporting-frame, of insulated means on said frame for lengthwise holding a metallic bar-member in fixed position thereon, movable means shiftable on said frame adapted to support and hold an elongated hollow metallic member in longitudinal alinement with, and with one end thereof in operative position relatively to, said bar-member, means for causing an electric current to pass only through said end of said hollow member to heat and thereby soften the same, and means on said frame and engaging said movable means adapted to shift the same with its carried hollow member toward said bar-member to position the softened end of said hollow member upon and around said bar-member; substantially as described.

3. In a machine of the class described, the combination with a sup orting-frame, of 1nsulated means on said fiame for lengthwise holding a metallic bar-member 1n fixed position thereon, movable means shiftable on said frame adapted to support and hold an elongated hollow metallic member in longitudinal alinement with, and with one end thereof in operative position relatively to, said bar-member, a plurality of sets of contact members on said frame, said contactmembers being included in an electric circuit and being adapted to electrically contact and engage with said hollow member only at said end to cause an electric current to pass through and heat and thereby soften the same, and means on said frame and engaging said movable means adapted to shift the same with its carried hollow member toward said bar-member to position the heated and softened end of said hollow member upon and around said bar-member; substantially as described.

4. In a machine of the class described, the combination with a supporting frame, of insulated means on said frame for lengthwise holding a metallic bar-member in ixed position on said frame, movable means'shiftable on said frame adapted to support and hold an elongated hollow metallic member in longitudinal alinement with, and with one end thereof in operative position relatively to, said bar-member, a pair of contact jaws on said frame, said jaws being included in an electric, circuit and being adapted to releasably grip and electrically engage with said hollow member at said. end thereof, a pair of coperat-ing contact-members on said frame also included in said circuit and adapted to removably electrically contact and engage with said hollow member at said end thereof, the circuit between said jaws and contact-members being completed p through said hollow member at sai end and said end thereof only being heated and softened by the electric current passing therethrough, and means on said frame and engaging said movable member adapted to shift the saine with its carried hollow inember toward said bar-member to position the heated and softened end of said hollow member upon and around said bar-member; substantially as described.

5` In a machine of the class described, a supporting frame, a longitudinally-slotted blOCk on said frame, tube-supporting means slidable on said block, and means comprising a bell-crank lever pivotally mounted on said frame and a link pivotally connected to said bell-crank lever and to said supporting means and movable in the slot of sai block adapted to slidably move said supporting means on said block; substantially as described.

6. In a machine of the class described, a Supporting frame, a block comprising upper and lower spaced apart members on said frame, a metallic tube-supporting member slidably mounted on the upper member of said block, and means comprising a bellcrank lever pivotally mounted on said trame and a link pivotally connected to said lever and to said supporting member and operable in the space between said upper and lower members orn said block adapted to slidably move said supporting member on said block; substantially as described.

7. In a machine of the class described, a supporting frame, a block comprising upper and lower spaced apart members on said frame, the upper member of said block being provided with a longitudinally-disposed slot, a tube-sup iorting member mounted on the upper mem er of said' block and provided with a depending portion movable in said slot thereof, and means comprising a bell-crank lever pivotally mounted on said frame and a link pivotally connected to said bell-crank lever and to said depending portion of said supporting member and movable in 4the space between the upper and lower members of said block adapted to move said supporting member on said block; substantially as described.

S. In a machine of the class described, the combination with a supporting frame, of metallic-section holding means on said frame, a contact member mounted on said frame, and a second contact member pivotally swingable on said frame and adapted to coperate with said first contact member, said contact members being included in an electric circuit and being adapted to electrically contact with the metallic section held by said holding means; substantially as described.

9. In a machine of the class described, the combination with a supporting frame, of metallic section holding means on said frame, and a pair of cooperating contactmembers pivotally swingable on said frame, said contact-members being included in an electric circuit and being adapted to electrically contact with the metallic section held by said holding means; substantially as described.

10., In a machine of the class described, the combination with a supporting frame, of metallic section holding means on said frame, a pair of cooperating contact-members pivotally arranged on said frame, said contact-members being included in an electrie circuit and being adapted to electrically contact with the metallic section held by said holding means, and means carried by said contact members adapted to releasably lock the same in electrical engagement withsaid metallic section;.substantially as described.

11,. In a machine of the class described, the combination with a supporting frame, of metallic sect-ion holding means 0n said frame, a pair of coperating contact-inemand means on said frame adapted to actuate contact-members being included in an elec- Vstantially as described. r

bers pivotally arranged on said frame, said tric circuit and being adapted to electrically contact with the metallic section held by said holding means, and means carried by said contact members adapted to releasably lock the same together and in electrical engagement with said metallic section; substantially as described.

12. In a,machine of the class described, a pair of coperating movable contact members included in an electric circuit and adapted to electrically engage with a metallic section and means comprising a curved lever pivotally mounted on one of said members and provided on one side with an eccentric grobve and a roller mounted on the other of said members and adapted to fit in and be engaged by said groove adapted to releasably lock said members together in electrical engagement with said metallic section; substantially as described.

13. In a machine of the class described, the combination with a support, of a pair of elongated plates secured thereto and extending outwardly therefrom, a pair of coperating contact members pivotally mounted on sald plates and included in an electric circuit, said contact' members being adapted to electrically engage with a metallic section, and means comprising a curved lever pivotally mounted on one of said members and provided with an eccentric groove and a roller mounted on the other of said members adapted to lit in and be engaged by said groove adapted to releasably lock said contactmembers together and in electrical engagement with said metallic section; sub- 14. In a machine of the class described, a pair of coperating pivotally swingable fluid cooled heads and contact members carried by said heads and included in an elec-1 tric circuit, said contact members being adapted to electrically engage with a section of metallic tubing; substantially as v described.

15. In a machine of the class described, the combination with a fixed supporting frame, of a pair of contact jaws on said frame and included in an electric circuit, means on said frame adapted to hold a metallic section in fixed osition relatively to said jaws, said jaws eing adapted to electrically enga e with the metallic section held by said hol ing means and one of said jaws being movable relatively to and toward the other jaw,

said movable jaw; substantially as described.

16. In a machine of the class described, the combination with a fixed supporting frame, of means on said frame ada ted to hold a metallic section in fixed position relatively to said jaws, a fixed contact jaw on said isaid recessed member between said jaws;

frame, a movable jaw shiftable on said frame toward, and adapted to coperate with, said fixed jaw, said jaws being included in an electric circuit and being adapted to electrically engage with the metallic section held by said holding means, and means on said frame adapted to shiftably actuate said movable jaw; substantially as described.

17. In a machine of the class described, the combination with a fixed supporting frame, of a block fixed on said frame and included in an electric circuit, said block being integrally provided with a metallic section contact jaw, a movable jaw shitable on said block toward and adapted to coperate with said first jaw, means on said frame adapted to hold a metallic section in lixed posltion relatively to said jaws, and means on said frame adapted to shiftably actuate said second jaw; substantially as described.

18. In a machine of the class described, a pair of coperating jaws, a recessed block adapted to fit between and insulated from said jaws, and means adapted to actuate said jaws to clamp said block therebetween; substantially as described.

19. In a machine of the class described, a supporting frame, a aw fixed on said frame a second jaw slidable on said rame toward said fixed jaw, a recessedblock adapted to fit between said jaws, and means adapted to actuate said movable jaw to clamp said block between said jaws; substantially as described.

20. In a machine of the class described, a. fixedly mounted block provided with an integral upstanding jaw, a second jaw slidably mounted on said block and adapted to coperate with said first 'aw, a recessed member adapted to fit on said block between said jaws, and means adapted to slidably move said second jaw on said block to clamp substantially as described.

21. In a machine of the class described, the combination with a lixed supporting frame, of metallic section holding means on said frame, and means arranged on said frame and comprising a lurality of spaced apart sets of contact-mem ers included in an electric circuit and adapted to4 electrically enga e with one end of the metallic section held y said holding means for causing an electric current to pass therethrough, the circuit therebetween being completed through said metallic section at said end thereof; substantially as described.

22. In a machine of the class described, the combination with a fixed supporting frame, of metallic section holding means on said frame, a contact jaw fixed on said frame, a contact jaw movable on said frame and adapted to coperate with said xed j aw, and a pair of contact-members pivotally arranged on said frame and spaced away In testimony whereof, I have signed my from sald ]aws, said )aws and contact memname to this speclcation, 1n the presence of bers being lncluded 1n an electric clrcuit and two subscr1b1ng W1tnesses.

being adapted to electrically engage With the THEODORE E. CRECELIUS. 5 metallic section held by said holding means l'Vitnesses:

for causing an electric current to pass there- RUTH PETERSON,

through; substantially as described. ZELMA D. PINCUS. 

